A learner understands that adding a one-digit number to a multiple of ten combines a whole number of tens with additional ones: for example, . Place-value representations, such as bundled tens, ten-frames, or a number line, show that the tens remain unchanged while the ones increase; this builds the foundation for composing two-digit numbers and later addition strategies, without extending to larger addends or regrouping.
A multiple of ten has whole groups of and ones. When you add a one-digit number, the groups of ten stay the same, and you add the new ones.
Example:
So,
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